CN102711258B - Method and device for avoiding inter-cell interference - Google Patents
Method and device for avoiding inter-cell interference Download PDFInfo
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- CN102711258B CN102711258B CN201110075558.2A CN201110075558A CN102711258B CN 102711258 B CN102711258 B CN 102711258B CN 201110075558 A CN201110075558 A CN 201110075558A CN 102711258 B CN102711258 B CN 102711258B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
Abstract
The embodiment of the invention discloses a method and a device for avoiding inter-cell interference and relates to the technical field of wireless communication. The inter-cell interference can be effectively avoided by low signaling interaction. The method comprises the following steps of: dividing users of a cell into safety users and collision users, wherein the safety users do not interfere with a neighbor cell or interfere with the neighbor cell in a preset range during downlink transmission of the users or when the users perform uplink transmission, and the collision users interfere with the neighbor cell out of the preset range during downlink transmission of the users or when the users perform uplink transmission; and assigning the collision users of the cell and the neighbor cell to different time frequency resources in a data transmission sub-frame. The invention is mainly applicable to avoiding of the inter-cell interference in cellular mobile communication systems.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to the method and apparatus avoiding presence of intercell interference.
Background technology
Presence of intercell interference is an intrinsic problem of cell mobile communication systems, in order to alleviate the impact of presence of intercell interference on communication system performance, can adopt the problem of inter-cell interference in following scheme reduction cell mobile communication systems at present: concrete steps are as follows:
1. each base station is equipped with directive antenna, and can select to carry out transfer of data to the direction formation wave beam of in multiple directions.
2. each base station is broadcasted in turn, and first its all wave beam of base station takes turns streaming one time, and then next base station broadcast, the rest may be inferred.In broadcasting process, each UE measures the signal strength signal intensity of each wave beam to oneself of each base station.
3.UE the information feed back measured to base station controller.Base station controller determines the corresponding relation of base station, wave beam and UE according to UE feedack.Effectively can avoid the interference of minizone.
Such scheme adopts beam forming technique to avoid presence of intercell interference, realize avoiding in the process of presence of intercell interference at employing such scheme, inventor finds that in prior art, at least there are the following problems: the Signalling exchange between UE and base station is frequent, and quantity is relatively large, namely need the signaling consumption of expenditure larger.
Summary of the invention
Embodiments of the invention provide a kind of method and apparatus avoiding presence of intercell interference, by less Signalling exchange, effectively can avoid presence of intercell interference.
For achieving the above object, embodiments of the invention adopt following technical scheme:
Avoid a method for presence of intercell interference, comprising:
This intra-cell users is divided into secured user and conflict user, when described secured user is for carrying out downlink transfer to it or when it carries out uplink, noiseless or its interference user within preset range that adjacent cell is produced to adjacent cell, when described conflict user is for carrying out downlink transfer to it or when it carries out uplink, the interference of adjacent cell generation is exceeded to the user of described preset range;
In the subframe of transfer of data, distribute described conflict user, the conflict user of Shi Zhe community and the conflict user of adjacent cell are distributed on different running time-frequency resources.
Avoid a device for presence of intercell interference, comprising:
Division unit, for this intra-cell users being divided into secured user and conflict user, when described secured user is for carrying out downlink transfer to it or when it carries out uplink, noiseless or its interference user within preset range that adjacent cell is produced to adjacent cell, when described conflict user is for carrying out downlink transfer to it or when it carries out uplink, the interference of adjacent cell generation is exceeded to the user of described preset range;
Allocation units, for distributing described conflict user in the subframe of transfer of data, the conflict user of Shi Zhe community and the conflict user of adjacent cell are distributed on different running time-frequency resources.
The method and apparatus of presence of intercell interference that what the embodiment of the present invention provided avoid, base station is divided into secured user and conflict user this community user, the conflict user of this community is distributed in the data transmission subframes of this base station by each base station, and the conflict user between the adjacent cell that existence is disturbed is dispensed on different running time-frequency resources.Because the conflict user between the adjacent cell that existence is disturbed uses different running time-frequency resources respectively, reach the interference of the user that avoids conflicting between adjacent cell, do not need to carry out a large amount of information interactions between base station and user, so, decrease more greatly signaling consumption and interaction time delay.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
A kind of flow chart avoiding the method for presence of intercell interference that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 avoids the flow chart of the method for presence of intercell interference for another kind that the embodiment of the present invention provides;
Fig. 3 for the base station that provides in the embodiment of the present invention temporally dimension to the schematic diagram of distribution conflict user in the subframe of transfer of data;
Fig. 4 is for the base station provided in the embodiment of the present invention is by the schematic diagram of frequency dimension to distribution conflict user in the subframe of transfer of data;
Fig. 5 is the flow chart of step 201 in Fig. 2;
Fig. 6 is the flow chart of a kind of execution mode of step 203 in Fig. 2;
Another execution mode flow chart of step 203 in Fig. 7 Fig. 2;
A kind of structure chart avoiding the device of presence of intercell interference that Fig. 8 provides for the embodiment of the present invention;
Fig. 9 avoids the structure chart of the device of presence of intercell interference for another kind that the embodiment of the present invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiments provide a kind of method avoiding presence of intercell interference, as shown in Figure 1, comprise the following steps:
101, this intra-cell users is divided into secured user and conflict user by base station, when secured user is for carrying out downlink transfer to it or when it carries out uplink, noiseless or that adjacent cell the is produced user of interference within preset range to adjacent cell, when conflict user is for carrying out downlink transfer to it or when it carries out uplink, the interference of adjacent cell generation is exceeded to the user of described preset range.In systems in practice, secured user may be from the user away from cell edge, or at cell edge but near there is no the user of other co-frequency cells; Conflict user may be positioned at cell edge and near have the user of other co-frequency cells.
In order to realize the mutual interference avoided between adjacent cell, first need the user meeting in community being produced interference to adjacent cell, the user that namely conflicts finds, and the conflict user in community is separated with safe user area.
102, base station is to distribution conflict user in the subframe of transfer of data, and the conflict user of Shi Zhe community and the conflict user of adjacent cell are distributed on different running time-frequency resources.
The method of presence of intercell interference that what the present embodiment provided avoid, base station is divided into secured user and conflict user this community user, the conflict user of this community is distributed in the data transmission subframes of this base station by each base station, and the conflict user between the adjacent cell that existence is disturbed is dispensed on different running time-frequency resources.Because the conflict user between the adjacent cell that existence is disturbed uses different running time-frequency resources, respectively so can avoid interfering with each other of the conflict user between adjacent cell.
Due to the method and apparatus avoiding presence of intercell interference that the embodiment of the present invention provides, conflict user between the adjacent cell of disturbing by making existence is dispensed on different running time-frequency resources, reach the interference of the user that avoids conflicting between adjacent cell, do not need to carry out a large amount of information interactions between base station and user, so, decrease more greatly signaling consumption and interaction time delay.
One as the present embodiment is improved, and the embodiment of the present invention provides another kind to avoid the method for presence of intercell interference, as shown in Figure 2, comprises the following steps:
201, base station or UE carry out interference environment measurement.
Concrete, as an embodiment of the present embodiment, as shown in Figure 5, this step can comprise the following steps:
If 201a base station calculates this cell base station average eguivalent interference value to adjacent cell user when downlink data transmission, the M of a transmitting uplink data time/frequency source block is set to quiet by base station.
If UE calculates this community user average eguivalent interference value to base station, adjacent cell when transmitting uplink data, the M of a downlink data transmission time/frequency source block is set to quiet by base station, and M is non-zero natural number.
Base station is set to M time/frequency source block of sub-frame of uplink or descending sub frame quiet.A time/frequency source block can transmit a symbol, such as, can think the RE (Resource Element, Resource Block) in LTE system.This M time/frequency source block can be distributed in up or descending OFDM symbol on different subcarriers He different as far as possible, to obtain the interference signal close to mean value.The quiet Resource Block of different districts must be orthogonal, namely not overlapped.
The interference signal that in a described M time/frequency source block, each time/frequency source block is subject to measured respectively by each antenna of 201b, base station or UE.
In the individual quiet time/frequency source block of M, base station PBS1 measures up interference signal on each antenna.UE measures descending interference signal on each antenna.Assuming that PBS1 has N number of antenna, for convenience of describing note B
n, mfor the signal that n-th antenna of PBS1 measures in m quiet Resource Block.Assuming that user UE has N number of antenna, note B
n, mfor the signal that n-th antenna of UE measures in m quiet Resource Block.
201c, base station or UE calculate the mean value of the interference signal that each antenna records.
Base station PBS1 or UE is averaged the interference signal that each antenna measures at different resource block, namely
202, base station or UE are when ensureing that the interference to base station, adjacent cell or user of this community user or base station is less than default interference value, calculate the beam transmission power making the Signal to Interference plus Noise Ratio of this cell base station or user maximum, or when ensureing that the Signal to Interference plus Noise Ratio of this cell base station or user is greater than default Signal to Interference plus Noise Ratio, calculate the beam transmission power making the interference to adjacent cell base station user of this community user or base station minimum, this community user or base station transmit according to described transmitting power when sending signal.
In order to determine the transmitting power of base station or UE further, first base station or UE measure the average interference signal of all antennas.Base station PBS1 calculate when after descending or up employing beam forming to the equivalence interference that adjacent cell produces, so-called equivalence disturb refer to this be not accurately equal descending or transmitting uplink data time real interference, a but approximation.
Such as, in downlink data transmission process, when the aerial array of base station PBS1 descending wave beam principal direction aligning direction angle φ time, the equivalence of adjacent cells always disturbed be
wherein, P
bSthe transmitting power of PBS1, P '
uEthe peak transmitted power of can be the average transmit power of UE also can be UE, α is a rule of thumb constant for design.
In transmitting uplink data process, when the aerial array of UE1 up wave beam aligning direction angle φ time, the equivalence that adjacent cells produces always is disturbed and is
wherein P
uEthe transmitting power of UE1, P '
bSthe peak transmitted power of can be the average transmit power of neighbor cell PBS also can be neighbor cell PBS, α is a rule of thumb constant for design.
According to the computing formula of above-mentioned equivalent interference power and the higher limit T to adjacent cells equivalence interference power, the transmitting power computing formula of this cell base station or user's maximization receiving terminal Signal to Interference plus Noise Ratio when guarantee is less than default interference value to adjacent cell interference can be obtained.Concrete, in downlink data transmission process, can according to formula
calculate the P making the Signal to Interference plus Noise Ratio of this cell base station maximum
bS(φ
i), in transmitting uplink data process, can formula be passed through
calculate the P making the Signal to Interference plus Noise Ratio of this community user maximum
uE(φ
i), wherein, T is the upper limit of base station to adjacent cells equivalence gross power; P
bS, peakdown peak magnitude transmitting power, the P of base station
uE, peakthe upstream peak transmitting power of user, P '
uEpeak transmitted power, the P ' of can be the average transmit power of UE also can be UE
bSthe peak transmitted power of can be the average transmit power of base station also can be base station,
the mean value of the interference signal recorded for a kth antenna, M are the quantity of antenna, k is non-zero natural number.
According to the computing formula of above-mentioned equivalent interference power, this cell base station or user can be obtained ensureing that receiving terminal Signal to Interference plus Noise Ratio minimizes the transmitting power computing formula to adjacent cell interference when being greater than default Signal to Interference plus Noise Ratio value.Can according to formula
calculate at beam direction φ
ion make the interference of this community user to adjacent cell minimum transmitting power, also can according to formula
calculate at beam direction φ
ion make the interference of this cell base station to adjacent cell minimum transmitting power, wherein, H (φ
i) represent direction φ
iuse channel, the P after beam forming
i+Ngross power, the SINR of representative interference and noise
thresit is the signal to noise ratio that selected user must meet.
203, base station or UE are when ensureing that the interference to base station, adjacent cell or user of this community user or base station is less than default interference value, calculate the beam direction angle making the Signal to Interference plus Noise Ratio of this cell base station or user maximum, or when ensureing that the Signal to Interference plus Noise Ratio of this cell base station or user is greater than default Signal to Interference plus Noise Ratio, calculate the beam direction angle making the interference to base station, adjacent cell or user of this community user or base station minimum, signal transmitting terminal is launched according to described orientation angle when sending signal.
Concrete, as an embodiment of the present embodiment, as shown in Figure 6, base station or UE calculate the maximum beam direction angle of the Signal to Interference plus Noise Ratio of Shi Zhe community receiving terminal.Specifically can comprise the following steps:
203a, base station or UE choose arbitrarily Q orientation angle, are designated as φ
1... φ
i... φ
q, I is non-zero natural number.
203b, base station or UE calculate the Signal to Interference plus Noise Ratio of receiving terminal corresponding to Q, this community orientation angle.
SINR (φ
i, P
bS) refer to when base station is aligning direction angle, the direction φ of wave beam
itime, the Signal to Interference plus Noise Ratio of this user.
203c, base station or UE obtain the φ that described in the receiving terminal of Shi Zhe community, Signal to Interference plus Noise Ratio is maximum
i.
According to formula
wherein, T is the upper limit of base station to adjacent cells equivalence gross power; P
bS, peakit is the down peak magnitude transmitting power of base station.At { φ
1, φ
2..., φ
qin find value and make when using this beam direction and corresponding through-put power, the letter drying of targeted customer is than SINR (φ
i, P
bS) maximum.
As the another kind of execution mode of the present embodiment, as shown in Figure 7, base station or UE calculate and disturb minimum orientation angle to the average eguivalent of adjacent cell.
Specifically can comprise the following steps:
203A, choose Q orientation angle arbitrarily, be designated as φ
1... φ
i... φ
q, I is non-zero natural number.
203B, calculate this cell transmission end interference value to base station, adjacent cell or user in Q orientation angle.
According to formula
calculate this community interference value to base station, adjacent cell or user in a transmitting terminal Q orientation angle.
203C, obtain the φ making the interference to base station, adjacent cell or user of this community user or base station minimum
i.
According to formula
wherein, SINR (φ
i, P
bS) refer to when base station is the aligning direction angle, direction of wave beam
the Signal to Interference plus Noise Ratio of Shi Xuanding user, SINR
thresit is the signal to noise ratio that selected user must meet; P
bS, peakit is the down peak magnitude transmitting power of base station.Calculate the interference minimum value making this community user or base station to base station, adjacent cell or user
and this velocity of wave direction corresponding to interference minimum value
with corresponding transmitting power.
204, this intra-cell users is divided into secured user and conflict user by base station or UE, when secured user is for carrying out downlink transfer to it or when it carries out uplink, noiseless or that adjacent cell the is produced user of interference within preset range to adjacent cell, when conflict user is for carrying out downlink transfer to it or when it carries out uplink, the interference of adjacent cell generation is exceeded to the user of described preset range.
In order to realize the mutual interference avoided between adjacent cell, first need the user meeting in community being produced interference to adjacent cell, the user that namely conflicts finds, and the conflict user in community is separated with safe user area.
As an embodiment of the present embodiment, some definition are done for secured user and conflict user:
Secured user: default interference value is less than to the interference of adjacent cell, and Signal to Interference plus Noise Ratio (SINR) is greater than the user of default Signal to Interference plus Noise Ratio.Concrete, ensureing that meet the user of this community user quality of service requirement, then this user is classified as secured user under prerequisite not higher than a preset upper limit value of the interference of adjacent cell.Or under the prerequisite ensureing this community user received signal quality, the interference of adjacent cell user is less than to the user of preset upper limit value, then this user is classified as secured user.In systems in practice, secured user may be from the user away from cell edge, or at cell edge but near there is no the user of other co-frequency cells.
Conflict user: the user not meeting secured user's standard is classified as conflict user.In systems in practice, the user that conflicts may be positioned at cell edge and near have the user of other co-frequency cells.
As an embodiment of the present embodiment, can according to the Signal to Interference plus Noise Ratio maximum SINR (φ calculated in step 203c
i, P
bS) divide secured user and conflict user, the Signal to Interference plus Noise Ratio maximum of base station or user is compared with the Signal to Interference plus Noise Ratio value preset, if the Signal to Interference plus Noise Ratio maximum of base station or user is more than or equal to default Signal to Interference plus Noise Ratio value, then this base station or user are secured user, otherwise this base station or user are conflict user.
As an embodiment of the present embodiment, secured user and conflict user can be divided according to this community user or the base station interference minimum value to base station, adjacent cell or user that makes obtained in step 203C, by base station or user, the interference minimum value to base station, adjacent cell or user compares with the interference value preset, if base station or the interference minimum value of user to base station, adjacent cell or user are less than default interference value, then this base station or user are secured user, otherwise this base station or user are conflict user.
The embodiment of the present invention requires that PBS (Pico Base Station (PBS), microcell base station) has aerial array, thus can select to form launching beam in multiple directions; Or the single antenna requiring PBS to have has multiple optional beam direction.Only have a kind of PBS of antenna beam can be considered as a special case and still be included in the scope of application of the present invention.
The embodiment of the present invention requires UE (User Equipment, subscriber equipment) to have aerial array thus can select to form launching beam in multiple directions; Or the single antenna requiring UE to have has multiple optional beam direction.Only have a kind of user of antenna beam can be considered as a special case and still be included in the scope of application of the present invention.
205, base station is to distribution conflict user in the subframe of transfer of data, and the conflict user of Shi Zhe community and the conflict user of adjacent cell are distributed on different running time-frequency resources.
As an embodiment of the present embodiment, first base station can receive the notification message of the conflict user method of salary distribution that adjacent cell user sends, and the conflict user of the conflict user and adjacent cell that comprise Shi Zhe community in this notification message is distributed in the method for salary distribution on different running time-frequency resources.
After receiving this notification message, base station is according to this notification message to distribution conflict user in the subframe of transfer of data, and the conflict user of Shi Zhe community and the conflict user of adjacent cell are distributed on different running time-frequency resources.
As the another kind of execution mode of the present embodiment, base station also can according to the method for salary distribution distribution conflict user preset, and the described conflict user of default method of salary distribution Shi Zhe community and the conflict user of adjacent cell are distributed on different running time-frequency resources.
When base station down transmits, user can self belonging to the information feed back of the user that uses safely or conflict to base station; Or base station can require that user carries out channel and interfere information feedback, thus calculating user belongs to secured user or conflict use.When base station arrangements secured user uplink transmission data, base station calculates user voluntarily and belongs to secured user or conflict use.When downlink transmission data is carried out to secured user in base station, its interference produced adjacent cells is in the scope that can tolerate.Conflict user can be interpreted as the user being in cell edge, when data are transmitted to conflict user in base station, it is considered to the normally descending of the conflict user that may have influence on adjacent cells to the interference of adjacent cells.When base station arrangements secured user uplink transmission data, its interference produced adjacent cells is in the scope that can tolerate.Conflict user can be interpreted as the user being in cell edge, when base station arrangements conflict user transmits data, it is considered to the normal upstream of the conflict user that may have influence on adjacent cells to the interference of adjacent cells.
Concrete, temporally dimension distribution conflict user and by frequency dimension distribution conflict user can be divided into, elaborate below.
Distribution conflict user is gone in base station temporally dimension, and as shown in Figure 3, Picocell 1 (community 1) and Picocell2 (community 2) is mutually contiguous community.In Picocell 1, the resource distribution mode of conflict user in a subframe is distribution of turning left from the right side by base station, and the user that namely conflicts is distributed in the signal of rear transmitting.And in Picocell 2, the conflict resource distribution mode of user in a subframe is distribute from left to right by base station, the user that namely conflicts distributes in the signal formerly launched.
Distribution conflict user is gone by frequency dimension in base station.As shown in Figure 4, in Picocell 1, the resource distribution mode of conflict user in a subframe is the subcarrier from the subcarrier of low frequency to high frequency by base station; And in Picocell 2, the resource distribution mode of conflict user in a subframe is the subcarrier from the subcarrier of high frequency to low frequency by base station.
Can comprehensive above-mentioned two kinds of modes, namely from time dimension also distribution conflict user on frequency dimension, make in conflict user at least one dimension namely in time or frequency different.
The method of presence of intercell interference that what the present embodiment provided avoid, base station is divided into secured user and conflict user this community user, the conflict user of this community is distributed in the data transmission subframes of this base station by each base station, and the conflict user between the adjacent cell that existence is disturbed is dispensed on different running time-frequency resources.Because the conflict user between the adjacent cell that existence is disturbed uses different running time-frequency resources, respectively so can avoid interfering with each other of the conflict user between adjacent cell.
Due to the method and apparatus avoiding presence of intercell interference that the embodiment of the present invention provides, conflict user between the adjacent cell of disturbing by making existence is dispensed on different running time-frequency resources, reach the interference of the user that avoids conflicting between adjacent cell, do not need to carry out a large amount of information interactions between base station and user, so, decrease more greatly signaling consumption and interaction time delay.
Embodiments provide a kind of device avoiding presence of intercell interference, as shown in Figure 8, comprising: division unit 81, allocation units 82.
Wherein, this intra-cell users is divided into secured user and conflict user by division unit 81, when described secured user is for carrying out downlink transfer to it or when it carries out uplink, noiseless or that adjacent cell the is produced user of interference within preset range to adjacent cell, when described conflict user is for carrying out downlink transfer to it or when it carries out uplink, the interference of adjacent cell generation is exceeded to the user of described preset range.
In order to realize the mutual interference avoided between adjacent cell, first need the user meeting in community being produced interference to adjacent cell, the user that namely conflicts finds, and the conflict user in community is separated with safe user area.
Allocation units 82 distribute described conflict user in the subframe of transfer of data, and the conflict user of Shi Zhe community and the conflict user of adjacent cell are distributed on different running time-frequency resources.
The device of presence of intercell interference that what the present embodiment provided avoid, base station is divided into secured user and conflict user this community user, the conflict user of this community is distributed in the data transmission subframes of this base station by each base station, and the conflict user between the adjacent cell that existence is disturbed is dispensed on different running time-frequency resources.Because the conflict user between the adjacent cell that existence is disturbed uses different running time-frequency resources, respectively so can avoid interfering with each other of the conflict user between adjacent cell.
Due to the method and apparatus avoiding presence of intercell interference that the embodiment of the present invention provides, conflict user between the adjacent cell of disturbing by making existence is dispensed on different running time-frequency resources, reach the interference of the user that avoids conflicting between adjacent cell, do not need to carry out a large amount of information interactions between base station and user, so, decrease more greatly signaling consumption and interaction time delay.
One as the present embodiment is improved, the embodiment of the present invention provides another kind to avoid the device of presence of intercell interference, as shown in Figure 9, comprising: the 3rd computing unit 91, first computing unit 92, second computing unit 93, division unit 94, allocation units 95, receiving element 96.
Wherein, the 3rd computing unit 91 comprises: arrange module 911, measurement module 912, first computing module 913.
First computing unit 92 comprises: choose module 921, computing module 922, acquisition module 923.
This intra-cell users is divided into secured user and conflict user by division unit 94, when described secured user is for carrying out downlink transfer to it or when it carries out uplink, noiseless or its interference user within preset range that adjacent cell is produced to adjacent cell, when described conflict user is for carrying out downlink transfer to it or when it carries out uplink, the interference of adjacent cell generation is exceeded to the user of described preset range.
Allocation units 95 distribute described conflict user in the subframe of transfer of data, and the conflict user of Shi Zhe community and the conflict user of adjacent cell are distributed on different running time-frequency resources.
Receiving element 96 receives the notification message of the conflict user method of salary distribution that adjacent cell sends, and the conflict user of the conflict user and adjacent cell that comprise Shi Zhe community in this notification message is distributed in the method for salary distribution on different running time-frequency resources.
As an embodiment of the present embodiment, allocation units 95 can distribute described conflict user after receiving element 96 receives the notification message of the conflict user method of salary distribution that adjacent cell sends in the subframe of transfer of data.
As the another kind of execution mode of the present embodiment, allocation units 95 also can distribute described conflict user according to the method for salary distribution preset, this default conflict user of method of salary distribution Shi Zhe community and the conflict user of adjacent cell be distributed on different running time-frequency resources.
3rd computing unit 91 calculates the interference of the adjacent cell that each antenna receives, and calculates the average eguivalent interference value of antenna to base station, adjacent cell or user.
Concrete, when downlink data transmission, the equivalence of adjacent cell user is always disturbed if calculate this community user, module 911 is set the M of a transmitting uplink data time/frequency source block is set to quiet; If calculate this community user always to disturb the equivalence of adjacent cell user when transmitting uplink data, arrange module 911 and be set to quiet by the M of a downlink data transmission time/frequency source block, M is non-zero natural number; Measurement module 912 measures for each antenna the interference signal that in a described M time/frequency source block, each time/frequency source block is subject to respectively; First computing module 913 calculates the mean value of the interference signal that each antenna records.
First computing unit 92 is when ensureing that the interference to base station, adjacent cell or user of this community user or base station is less than default interference value, calculate the beam direction angle making the Signal to Interference plus Noise Ratio of this cell base station or user maximum, or when ensureing that the Signal to Interference plus Noise Ratio of this cell base station or user is greater than default Signal to Interference plus Noise Ratio, calculate the beam direction angle making the interference to adjacent cell base station user of this community user or base station minimum, signal transmitting terminal is launched according to described orientation angle when sending signal.
Concrete, choose module 921 and choose arbitrarily Q orientation angle, be designated as φ
1... φ
i... φ
q, I is non-zero natural number; Computing module 922 calculates the Signal to Interference plus Noise Ratio of base station corresponding to Q, this community orientation angle or each user, for calculating the interference of Q, this community orientation angle to base station, adjacent cell or user; Acquisition module 923 obtains and makes when ensureing that the interference to base station, adjacent cell or user of this cell transmission antenna is less than default interference value the φ that described in this cell base station or user, Signal to Interference plus Noise Ratio is maximum
i, for obtaining ensureing the Signal to Interference plus Noise Ratio of this cell base station or user makes the interference to base station, adjacent cell or user of this community user or base station minimum φ when being greater than default Signal to Interference plus Noise Ratio
i.
Second computing unit 93 is when ensureing that the interference to base station, adjacent cell or user of this community user or base station is less than default interference value, calculate the beam transmission power making the Signal to Interference plus Noise Ratio of this cell base station or user maximum, or when ensureing that the Signal to Interference plus Noise Ratio of this cell base station or user is greater than default Signal to Interference plus Noise Ratio, calculate the beam transmission power making the interference to adjacent cell base station user of this community user or base station minimum, signal transmitting terminal is launched according to described transmitting power when sending signal.
As an embodiment of the present embodiment, the second computing unit 93 can according to formula
calculate the P making the Signal to Interference plus Noise Ratio of this cell base station maximum
bS(φ
i), or according to formula
calculating makes the Signal to Interference plus Noise Ratio of this community user maximum
wherein, T is the upper limit of base station to adjacent cells equivalence gross power; P
bS, peakdown peak magnitude transmitting power, the P of base station
uE, peakthe upstream peak transmitting power of user, P '
uEpeak transmitted power, the P ' of can be the average transmit power of UE also can be UE
bSthe peak transmitted power of can be the average transmit power of base station also can be base station,
the mean value of the interference signal recorded for a kth antenna, M are the quantity of antenna, k is non-zero natural number.
As the another kind of execution mode of the present embodiment, the second computing unit 93 can according to formula
calculate at beam direction φ
ion make the interference of this cell base station to adjacent cell minimum transmitting power, can also according to formula
calculate at beam direction φ
ion make the interference of this community user to adjacent cell minimum transmitting power, wherein, H (φ
i) represent direction φ
iuse channel, the P after beam forming
i+Ngross power, the SINR of representative interference and noise
thresit is the signal to noise ratio that selected user must meet.
The device of presence of intercell interference that what the present embodiment provided avoid, base station is divided into secured user and conflict user this community user, the conflict user of this community is distributed in the data transmission subframes of this base station by each base station, and the conflict user between the adjacent cell that existence is disturbed is dispensed on different running time-frequency resources.Because the conflict user between the adjacent cell that existence is disturbed uses different running time-frequency resources, respectively so can avoid interfering with each other of the conflict user between adjacent cell.
Due to the method and apparatus avoiding presence of intercell interference that the embodiment of the present invention provides, conflict user between the adjacent cell of disturbing by making existence is dispensed on different running time-frequency resources, reach the interference of the user that avoids conflicting between adjacent cell, do not need to carry out a large amount of information interactions between base station and user, so, decrease more greatly signaling consumption and interaction time delay.
The embodiment of the present invention can be applied in the scene with directional interference, also can be applied in the scene without directional interference, makes only to need between base station a small amount of just can realize mutually avoiding of presence of intercell interference wave beam alternately.Compared with prior art, the great advantage of this programme is exactly lower to the requirement of inter base station communication, and the running of base station is relatively independent, is applicable to the deployment of large scale network.
Other embodiments of the present invention comprise the uplink and downlink transfer of data of the femtocell network of dense deployment.So-called dense deployment refers to there is interference mutually between femtocell.In this scenario, the interference between femtocell is likely that band is directive.Such as, can with reference to the situation of disposing femtocell in residential quarter.All dispose a femtocell base station for every; Descending interference between femtocell comes from window, with obvious directivity.
The embodiment of the present invention is applicable in femto cell, carries out the scene of data transmission in the dense network be namely made up of microcell base station.So-called dense network refers to the mutual interference that there is transfer of data between femto cell due to close together.Such as, dense network may occur but be not limited to disposing femto cell continuously in Urban Streets.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add required common hardware by software and realize, and can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product is stored in the storage medium that can read, as the floppy disk of computer, hard disk or CD etc., comprise some instructions and perform method described in each embodiment of the present invention in order to make a computer equipment (can be personal computer, server, or the network equipment etc.).
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (16)
1. avoid a method for presence of intercell interference, it is characterized in that, comprising:
This intra-cell users is divided into secured user and conflict user, when described secured user is for carrying out downlink transfer to it or when it carries out uplink, noiseless or its interference user within preset range that adjacent cell is produced to adjacent cell, when described conflict user is for carrying out downlink transfer to it or when it carries out uplink, the interference of adjacent cell generation is exceeded to the user of described preset range;
In the subframe of transfer of data, distribute described conflict user, the conflict user of Shi Zhe community and the conflict user of adjacent cell are distributed on different running time-frequency resources;
Described this intra-cell users is divided into secured user and conflict user before, also comprise:
When ensureing that the interference to base station, adjacent cell or user of this community user or base station is less than default interference value, calculate the beam direction angle making the Signal to Interference plus Noise Ratio of this cell base station or user maximum, or when ensureing that the Signal to Interference plus Noise Ratio of this cell base station or user is greater than default Signal to Interference plus Noise Ratio, calculate the beam direction angle making the interference to adjacent cell base station user of this community user or base station minimum, signal transmitting terminal is launched according to described orientation angle when sending signal; Or,
Described this intra-cell users is divided into secured user and conflict user before, also comprise:
When ensureing that the interference to base station, adjacent cell or user of this community user or base station is less than default interference value, calculate the beam transmission power making the Signal to Interference plus Noise Ratio of this cell base station or user maximum, or when ensureing that the Signal to Interference plus Noise Ratio of this cell base station or user is greater than default Signal to Interference plus Noise Ratio, calculate the beam transmission power making the interference to adjacent cell base station user of this community user or base station minimum, signal transmitting terminal is launched according to described transmitting power when sending signal.
2. the method avoiding presence of intercell interference according to claim 1, is characterized in that, distribute described conflict user in the subframe of transfer of data before, described method also comprises:
Receive the notification message of the conflict user method of salary distribution that adjacent cell sends, the conflict user of the conflict user and adjacent cell that comprise Shi Zhe community in described notification message is distributed in the method for salary distribution on different running time-frequency resources.
3. the method avoiding presence of intercell interference according to claim 1, it is characterized in that, described distribute in the subframe of transfer of data described conflict user be: according to preset the method for salary distribution distribute described conflict user, the described conflict user of default method of salary distribution Shi Zhe community and the conflict user of adjacent cell are distributed on different running time-frequency resources.
4. the method avoiding presence of intercell interference according to claim 3, is characterized in that, described method also comprises:
Calculate the interference of the adjacent cell that each antenna receives, calculate the average eguivalent interference value of antenna to base station, adjacent cell or user.
5. the method avoiding presence of intercell interference according to claim 1, is characterized in that, the beam direction angle that described calculating makes the Signal to Interference plus Noise Ratio of this cell base station or user maximum comprises:
Choose arbitrarily Q orientation angle, be designated as φ
1... φ
i... φ
q, I, Q are non-zero natural number;
Calculate the Signal to Interference plus Noise Ratio of base station corresponding to Q, this community orientation angle or user, and calculate the interference value of Q, this community orientation angle to base station, adjacent cell or user;
Obtaining when ensureing that the interference of this antenna in cell to base station, adjacent cell or user is less than default interference value, making Signal to Interference plus Noise Ratio described in this cell base station or user maximum
φ i;
Described calculating makes the minimum beam direction angle of this community user or the base station interference to base station, adjacent cell or user comprise:
Choose arbitrarily Q orientation angle, be designated as φ
1... φ
i... φ
q, I, Q are non-zero natural number;
Calculate the Signal to Interference plus Noise Ratio of base station corresponding to Q, this community orientation angle or user and the interference value to base station, adjacent cell or user;
Obtaining when ensureing that the Signal to Interference plus Noise Ratio of this cell base station or user is greater than default Signal to Interference plus Noise Ratio, making the φ that the interference to base station, adjacent cell or user of this community user or base station is minimum
i.
6. the method avoiding presence of intercell interference according to claim 1, is characterized in that, the beam transmission power that described calculating makes the Signal to Interference plus Noise Ratio of this cell base station or user maximum is: according to formula
calculate at beam direction φ
ion make the Signal to Interference plus Noise Ratio of this community user maximum this cell base station transmitting power P
bS(φ
i), or according to formula
calculate at beam direction φ
ion make the Signal to Interference plus Noise Ratio of this cell base station maximum this community user transmitting power P
uE(φ
i), wherein, T is the upper limit of base station to adjacent cells equivalence interference gross power; P
bS, peakdown peak magnitude transmitting power, the P of base station
uE, peakthe upstream peak transmitting power of user, P'
uEand P'
bSbe the average transmit power of user and base station respectively or be the peak transmitted power of user and base station respectively,
the mean value of the interference signal recorded for a kth antenna, M are the quantity of antenna, k is non-zero natural number;
Described calculating makes the minimum beam transmission power of this community user or the base station interference to base station, adjacent cell or user be: according to formula
calculate at beam direction φ
ion make the interference of this community user to adjacent cell minimum transmitting power, or according to formula
calculate at beam direction φ
ion make the interference of this cell base station to adjacent cell minimum transmitting power, wherein, H (φ
i) represent direction φ
iuse channel, the P after beam forming
i+Nrepresent gross power, the SINR of receiving terminal interference and noise
thresit is the Signal to Interference plus Noise Ratio that receiving terminal need meet.
7. the method avoiding presence of intercell interference according to claim 5, is characterized in that, the average eguivalent interference value of described calculating antenna to adjacent cell user comprises:
If calculate this cell base station average eguivalent interference value to adjacent cell user when downlink data transmission, the M of a transmitting uplink data time/frequency source block is set to quiet;
If calculate this community user average eguivalent interference value to base station, adjacent cell when transmitting uplink data, be set to quiet by the M of a downlink data transmission time/frequency source block, M is non-zero natural number;
The interference signal that in a described M time/frequency source block, each time/frequency source block is subject to measured respectively by each antenna;
Calculate the mean value of the interference signal that each antenna records.
8. the method avoiding presence of intercell interference according to any one of claim 1 to 7, it is characterized in that, described secured user is less than described default interference value to the interference of adjacent cell, receiving terminal Signal to Interference plus Noise Ratio is greater than described default Signal to Interference plus Noise Ratio, and transmitting power is less than or equal to the user of peak transmitted power; User beyond secured user is conflict user.
9. the method avoiding presence of intercell interference according to claim 8, is characterized in that, described method also comprises:
In downlink data transmission process, improve the transmitting power to conflict user; Or, in transmitting uplink data process, improve the transmitting power of conflict user uplink.
10. avoid a device for presence of intercell interference, it is characterized in that, comprising:
Division unit, for this intra-cell users being divided into secured user and conflict user, when described secured user is for carrying out downlink transfer to it or when it carries out uplink, noiseless or its interference user within preset range that adjacent cell is produced to adjacent cell, when described conflict user is for carrying out downlink transfer to it or when it carries out uplink, the interference of adjacent cell generation is exceeded to the user of described preset range;
Allocation units, for distributing described conflict user in the subframe of transfer of data, the conflict user of Shi Zhe community and the conflict user of adjacent cell are distributed on different running time-frequency resources;
Wherein, the device of presence of intercell interference is avoided also to comprise described in:
First computing unit, for when ensureing that the interference to base station, adjacent cell or user of this community user or base station is less than default interference value, calculate the beam direction angle making the Signal to Interference plus Noise Ratio of this cell base station or user maximum, or when ensureing that the Signal to Interference plus Noise Ratio of this cell base station or user is greater than default Signal to Interference plus Noise Ratio, calculate the beam direction angle making the interference to base station, adjacent cell or user of this community user or base station minimum, signal transmitting terminal is launched according to described orientation angle when sending signal; Or,
The described device of presence of intercell interference of avoiding also comprises:
Second computing unit, for when ensureing that the interference to base station, adjacent cell or user of this community user or base station is less than default interference value, calculate the beam transmission power making the Signal to Interference plus Noise Ratio of this cell base station or user maximum, or when ensureing that the Signal to Interference plus Noise Ratio of this cell base station or user is greater than default Signal to Interference plus Noise Ratio, calculate the beam transmission power making the interference to base station, adjacent cell or user of this community user or base station minimum, signal transmitting terminal is launched according to described transmitting power when sending signal.
11. devices avoiding presence of intercell interference according to claim 10, is characterized in that, described in avoid the device of presence of intercell interference also to comprise:
Receiving element, for receiving the notification message of the conflict user method of salary distribution that adjacent cell sends, the conflict user of the conflict user and adjacent cell that comprise Shi Zhe community in described notification message is distributed in the method for salary distribution on different running time-frequency resources.
12. devices avoiding presence of intercell interference according to claim 10, it is characterized in that, described allocation units distribute described conflict user in the subframe of transfer of data: described allocation units distribute described conflict user according to the method for salary distribution preset, and the described conflict user of default method of salary distribution Shi Zhe community and the conflict user of adjacent cell are distributed on different running time-frequency resources.
13. devices avoiding presence of intercell interference according to claim 12, is characterized in that, described in avoid the device of presence of intercell interference also to comprise:
3rd computing unit, for calculating the interference of the adjacent cell that each antenna receives, calculates the average eguivalent interference value of antenna to base station, adjacent cell or user.
14. devices avoiding presence of intercell interference according to claim 10, is characterized in that, described first computing unit comprises:
Choosing module, for choosing arbitrarily Q orientation angle, being designated as φ
1... φ
i... φ
q, I, Q are non-zero natural number;
Computing module, for calculating the Signal to Interference plus Noise Ratio of base station corresponding to Q, this community orientation angle or user, and calculates the interference value of Q, this community orientation angle to base station, adjacent cell or user;
Acquisition module, for obtaining when ensureing that the interference of this antenna in cell to base station, adjacent cell or user is less than default interference value, makes the φ that described in this cell base station or user, Signal to Interference plus Noise Ratio is maximum
i, obtaining when ensureing that the Signal to Interference plus Noise Ratio of this cell base station or user is greater than default Signal to Interference plus Noise Ratio, making the φ that the interference to base station, adjacent cell or user of this community user or base station is minimum
i.
15. devices avoiding presence of intercell interference according to claim 14, is characterized in that, described second computing unit calculates the beam transmission power making the Signal to Interference plus Noise Ratio of this cell base station or user maximum and is: described second computing unit is according to formula
calculate at beam direction φ
ion make the Signal to Interference plus Noise Ratio of this community user maximum P
bS(φ
i), or according to formula
calculate at beam direction φ
ion make the Signal to Interference plus Noise Ratio of this cell base station maximum P
uE(φ
i), wherein, T is the upper limit of base station to adjacent cells equivalence gross power; P
bS, peakdown peak magnitude transmitting power, the P of base station
uE, peakthe upstream peak transmitting power of user, P'
uEand P'
bSthe peak transmitted power of to be user and base station average transmit power respectively be also respectively user and base station,
the mean value of the interference signal that a kth antenna records, M are the quantity of antenna, k is non-zero natural number;
Described second computing unit calculates and makes the minimum beam transmission power of this community user or the base station interference to base station, adjacent cell or user be: according to formula
calculate at beam direction φ
ion make the interference of this community user to adjacent cell minimum transmitting power, or according to formula
calculate at beam direction φ
ion make the interference of this cell base station to adjacent cell minimum transmitting power, wherein, H (φ
i) represent direction φ
iuse channel, the P after beam forming
i+Nrepresent gross power, the SINR of receiving terminal interference and noise
thresit is the Signal to Interference plus Noise Ratio that receiving terminal must meet.
16. devices avoiding presence of intercell interference according to claim 13, is characterized in that, described 3rd computing unit comprises:
Module is set, if for calculating the average eguivalent interference value of this cell base station when downlink data transmission to adjacent cell user, be set to quiet by the M of a transmitting uplink data time/frequency source block; If calculate this community user average eguivalent interference value to base station, adjacent cell when transmitting uplink data, be set to quiet by the M of a downlink data transmission time/frequency source block, M is non-zero natural number;
Measurement module, measures for each antenna the interference signal that in a described M time/frequency source block, each time/frequency source block is subject to respectively;
First computing module, for calculating the mean value of the interference signal that each antenna records.
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| CN201110075558.2A CN102711258B (en) | 2011-03-28 | 2011-03-28 | Method and device for avoiding inter-cell interference |
| PCT/CN2011/080919 WO2012129903A1 (en) | 2011-03-28 | 2011-10-18 | Method and device for preventing inter-cell interference |
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| CN103250452B (en) * | 2012-12-31 | 2016-10-12 | 华为技术有限公司 | The neighbouring sending method of identity indication code, subscriber equipment and base station |
| CN104038455B (en) * | 2013-03-08 | 2017-03-29 | 京信通信技术(广州)有限公司 | A kind of disturbance restraining method and device of ascending control channel |
| US9491776B2 (en) * | 2014-07-23 | 2016-11-08 | Intel Corporation | Systems and methods for scheduling communication between wireless devices to reduce interference associated with full duplex communication in multi-cell networks |
| US11196462B2 (en) * | 2016-02-22 | 2021-12-07 | Qualcomm Incorporated | Multi-layer beamforming in millimeter-wave multiple-input/multiple-output systems |
| CN107846687B (en) * | 2016-09-20 | 2023-04-18 | 中兴通讯股份有限公司 | Inter-cell cooperative scheduling method, device and base station |
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| CN1881867A (en) * | 2005-06-17 | 2006-12-20 | 华为技术有限公司 | Method for eliminating interference between cells |
| CN101553035A (en) * | 2008-04-03 | 2009-10-07 | 中兴通讯股份有限公司 | Distribution method of time frequency resources |
| CN101711058A (en) * | 2009-12-15 | 2010-05-19 | 中兴通讯股份有限公司 | Resource allocation method and resource allocation system |
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| CN101730239B (en) * | 2008-10-24 | 2012-05-09 | 中兴通讯股份有限公司 | Method for distributing cell frequency resources and terminal channel quality indicated value feedback device |
| US8243670B2 (en) * | 2009-08-19 | 2012-08-14 | Chunghwa Telecom Co., Ltd. | User grouping method for inter-cell interference coordination in mobile telecommunication |
| CN101945409B (en) * | 2010-09-03 | 2014-11-19 | 新邮通信设备有限公司 | Method and device for coordinating dynamic interference between neighboring cells of wireless communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1881867A (en) * | 2005-06-17 | 2006-12-20 | 华为技术有限公司 | Method for eliminating interference between cells |
| CN101553035A (en) * | 2008-04-03 | 2009-10-07 | 中兴通讯股份有限公司 | Distribution method of time frequency resources |
| CN101711058A (en) * | 2009-12-15 | 2010-05-19 | 中兴通讯股份有限公司 | Resource allocation method and resource allocation system |
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